- // MIR for `size_of` before GVN
+ // MIR for `size_of` after GVN
  
  fn size_of() -> usize {
      let mut _0: usize;
      let mut _1: usize;
      scope 1 {
          debug a => _1;
      }
  
      bb0: {
          StorageLive(_1);
          _1 = const 0_usize;
          _1 = const _;
          _0 = _1;
          StorageDead(_1);
          return;
      }
  }
  
